We made an IRC channel on freenode.net for Oneplus One developers, but obviously anyone who has a question regarding development (not help for installing roms, kernels, etc) can join. The channel is #oneplusonedevs
I've been in there and there is always a lot of spam. We had talks easily in #oneplusonedevstheres already a channel on freenode thats been there since like february. its ##oneplusone. it has actual cyanogenmod people in there already.